added test for extraction of a positive constant without math operators as well as corresponding functionality

src/main/py/read_math_function.py

@@ -52,3 +52,8 @@ def simplify_easy_math_function(type, function):
         return False
     if is_string(function) == False or is_allowed_string("c", function) == True:
         return simplify_constant("c", function)
+
+def extract_constant(function):
+    coefficient, constant = function.split('x', 1) if 'x' in function else (function, '')
+    constant = constant.lstrip('+')
+    return [constant, f"{coefficient}x"]

src/test/py/test_read_math_function.py

@@ -38,6 +38,8 @@ class read_function(unittest.TestCase):
         self.assertEqual(simplify_easy_math_function("v", 42), 42)
     def test_easy_function_string_is_constant(self):
         self.assertEqual(simplify_easy_math_function("v", "42^(2)+1-3*4/3"), 1761)
+    def test_extraction_linear_function_constant_without_math_operators_addition(self):
+        self.assertEqual(extract_constant("42x+5"), ["5", "42x"])
 
 if __name__ == '__main__':
     unittest.main()